The Finn has just penned a new deal with the Canaries.
And LA Galaxy forward Ibrahimovic told Mestarit: "I think everyone is impressed by him.
"When you score many goals and lead a team into the Premier League - the biggest thing that can happen - and become number one in the Championship, which I see as a difficult league, because it is very aggressive and has many tough matches, it means that you have had a good season.
"The next season will be harder for him, because now he has to play against the elite. And my own experience is that scoring goals in the Premier League is not easy.
"But I'm pretty sure he can handle it. He will be more motivated and have greater ambitions now that he is in the Premier League. Hopefully he can repeat what he did in the Championship."